globalchange  > 气候变化事实与影响
CSCD ID: CSCD:6064330
Title:
模拟N沉降和埋土对黄顶菊凋落物分解及养分释放的影响
Alternative Title: Effects of simulated N deposition and burial on Flaveria bidentis litter decomposition and nutrient release
Author: 魏子上1; 李慧燕2; 李科利2; 杨殿林2; 皇甫超河1
Source Publication: 生态学杂志
ISSN: 1000-4890
Publishing Year: 2017
Volume: 36, Issue:9, Pages:408-415
Language: 中文
keyword in Chinese: 黄顶菊 ; 入侵植物 ; 氮沉降 ; 埋土处理 ; 凋落物分解
Keyword: Flaveria bidentis ; invasive plant ; nitrogen deposition ; soil burial ; litter decomposition
WOS Category: PLANT SCIENCES
WOS Research Area: Plant Sciences
Abstract: 生物入侵和氮沉降加剧作为两种全球变化因子,可能共同影响入侵植物凋落物分解过程。了解入侵植物和氮沉降单独或二者对凋落物分解的复合影响,有助于揭示全球变化背景下的植物入侵机理,并为降低入侵植物危害提供理论依据。本试验以入侵植物黄顶菊(Flaveria bidentis)和共生本地植物狗尾草(Setaria viridis)叶片凋落物为对象,采用凋落袋法研究了氮添加和埋土处理对其残留率,C、N含量和C /N的影响,本试验共有4个处理,分别是:模拟N沉降处理、埋土处理、模拟N沉降和施氮共同处理以及对照。结果显示,模拟N沉降明显降低了黄顶菊叶凋落物分解速率,分解常数k值为1.68,显著小于对照的2.26,而对狗尾草叶片凋落物分解无显著影响。埋土以及埋土和模拟N沉降共同处理对两种植物凋落物分解均具有显著促进作用。特别地,单一倍增氮沉降因素并未影响黄顶菊叶片凋落物N释放,而埋土和二者综合作用显著促进其N释放。未来氮素沉降水平倍增情形下,以及凋落物不同管理方式(埋土或土表)均可影响入侵种凋落物的分解速率和养分动态,但存在物种差异,这种差异主要由于凋落物质量的差别。
English Abstract: Nowadays,biological invasions and enhanced nitrogen (N) deposition are two key elements of global change; however,their interactive effects on litter decomposition remain unclear. The present study aims to test whether the interactive effects of these two environmental factors on the litter decomposition and nutrient dynamics are stronger than that of each individual factor. A litter-bag method was used to examine the effects of simulated N deposition and burial on mass remaining and the dynamics of N,C,and C /N of leaf litters of invasive plant Flaveria bidentis and co-occurring native Setaria viridis during decomposition. Four treatments were set as following: (1) enhanced N deposition (100% enhancement,28 kg N·hm~(-2)·a~(-1)),(2) burial (in 10 cm depth soil),(3) the combined treatment of the two factors (N deposition enhancement + burial),and (4) the control treatment without N addition and burial. Results showed that the litter decomposition constant (k) of F. bidentis leaf litter under simulated N deposition was significantly decreased compared with the control (1.68 vs. 2.26,respectively),while there was little effect of enhanced N on the decomposition of S. viridis leaf litter. In contrast,burial alone or combined with enhanced N deposition tended to significantly enhance the leaf decomposition of both test species. In particular,while the combination of N deposition and burial significantly enhanced N release from F. bidentis leaf litter,N deposition alone did not affect the N release. Under increasing N deposition,litter management option (soil burial or soil surface) may affect the decomposition rate and nutrient dynamics of invasive species litter.
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/153077
Appears in Collections:气候变化事实与影响

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Affiliation: 1.沈阳农业大学植物保护学院, 沈阳, 辽宁 110866, 中国
2.农业部环境保护科研监测所, 天津 300191, 中国

Recommended Citation:
魏子上,李慧燕,李科利,等. 模拟N沉降和埋土对黄顶菊凋落物分解及养分释放的影响[J]. 生态学杂志,2017-01-01,36(9):408-415
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